Book Image

Getting Started with Kubernetes, Second Edition - Second Edition

By : Jonathan Baier
Book Image

Getting Started with Kubernetes, Second Edition - Second Edition

By: Jonathan Baier

Overview of this book

Kubernetes has continued to grow and achieve broad adoption across various industries, helping you to orchestrate and automate container deployments on a massive scale. This book will give you a complete understanding of Kubernetes and how to get a cluster up and running. You will develop an understanding of the installation and configuration process. The book will then focus on the core Kubernetes constructs such as pods, services, replica sets, replication controllers, and labels. You will also understand how cluster level networking is done in Kubernetes. The book will also show you how to manage deployments and perform updates with minimal downtime. Additionally, you will learn about operational aspects of Kubernetes such as monitoring and logging. Advanced concepts such as container security and cluster federation will also be covered. Finally, you will learn about the wider Kubernetes ecosystem with OCP, CoreOS, and Tectonic and explore the third-party extensions and tools that can be used with Kubernetes. By the end of the book, you will have a complete understanding of the Kubernetes platform and will start deploying applications on it.
Table of Contents (20 chapters)
Title Page
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Our first Kubernetes application


Before we move on, let's take a look at these three concepts in action. Kubernetes ships with a number of examples installed, but we will create a new example from scratch to illustrate some of the concepts.

We already created a pod definition file, but as you learned, there are many advantages to running our pods via replication controllers. Again, using the book-examples/02_example folder we made earlier, we will create some definition files and start a cluster of Node.js servers using a replication controller approach. Additionally, we'll add a public face to it with a load-balanced service.

Use your favorite editor to create the following file:

apiVersion: v1 
kind: ReplicationController 
metadata: 
  name: node-js 
  labels: 
    name: node-js 
spec: 
  replicas: 3 
  selector: 
    name: node-js 
  template: 
    metadata: 
      labels: 
        name: node-js 
    spec: 
      containers: 
      - name: node-js 
        image: jonbaier/node-express-info...